"We know we're not going to be in a position, given the incubation period of the disease, to make a decision about returning to racing until first thing next week at the very earliest".
Three jump meetings had been due to take place in Britain today at Huntingdon, Doncaster and Ffos Las as well as an all-weather Flat meeting at Chelmsford.
Following consultations between the IHRB board, the Veterinary Committee, HRI and the Irish Equine Centre overnight the belief is that the risk to disease in thoroughbreds in Ireland has not changed.
With McCain-trained horses running in Britain this week that potentially exposed a significant number of horses from yards across Britain and in Ireland.
Meanwhile, Donald McCain has confirmed that the three cases previously detailed came from his yard in Cheshire.
Tim Vaughan was one of many Welsh trainers who had horses entered to race today as well as at Cheltenham Festival next month.
While the McCain-trained runners who tested positive were not on track this week, the trainer had runners at Ayr and Ludlow on Wednesday and Wolverhampton on Monday.
The British Horseracing Authority has confirmed three cases of equine influenza, triggering the cancellation of all racing in Britain for the next several days and the shutdown of training yards across the country. The BHA is presently communicating with yards potentially exposed, to ensure appropriate quarantine and biosecurity measures are put in place and horse movements restricted to avoid potential further spread of the disease.
In an attempt to limit the spread of the respiratory infection, which can be transmitted through the air and by humans, all horse racing in Britain has been cancelled until at least Wednesday, February 13, to allow the BHA to gather the information it needs from potentially infected horses.
This situation is being closely monitored in consultation with the Department of Agriculture, Food and Marine.
Racing was, however, set to go ahead in Ireland at Thurles on Thursday.
Although symptoms can be mild in vaccinated horses, the virus can be very risky to unvaccinated horses, although it is rarely fatal.
It is the most potentially damaging of the respiratory viruses that occur in United Kingdom equines and disease symptoms in non-immune animals include high fever, coughing and nasal discharge.